#include <cstdio>
using namespace std;

int a[18]={1,2,5,14,42,132,429,1430,4862,16796,58786,208012,742900,2674440,9694845,35357670,129644790,477638700};

int main() {
    int n;
	scanf("%d",&n);
	printf("%d",a[n-1]);
	return 0;
}